Dear Friends, I often tell my student pilots that it is wise to hold on before taking off when another aircraft has just taken off. Even two minutes is not enough sometimes because the wake turbulence may move in an unpredictable way – rather sideways – depending on the wind but not only. You can watch a previous post in which a spectacular uncontrolled roll happened: http://airforces.fr/2016/03/06/must-see-weird-takeoff-explained/ I have repeated that over and over – waiting is as wise as safe:
We cannot see clearly what really made the seaplane – assumed to be a French Canadair CL-415 Superscooper water bomber – veer off but it was definitely too close to the previous aircraft. Maybe the pilot wanted to do the right thing by saving time to save more lives. Was it because of the bow wake of the flying boat? Because of the air wake turbulence? A human error? A control failure? Or a combination of several factors? Anyway when you see an aircraft of this size taking off, please wait for two minutes before entering the same path. Fortunately, a pole was clipped, the Canadair was damaged, but it could have been worse.
In this tutorial, we will explore the foremost common classifications of fire extinguishers.
The first, and most common type of extinguisher is used for a Class A fire. These are fires fueled by ordinary combustible materials such as paper, wood, carbon, most plastics. The Class A fire extinguisher uses the water to smother the fire.
Class B fires are fueled by flammable liquids such as gasoline, kerosene, grease, and oil. Remember this classification extinguisher – think « B » for Boil, or oil. Class B extinguishers typically use liquid foam agent to smother the fire. You never want to use water on a Class B fire, as the water can cause the flammable liquids to spread like we accidentally drip water on a frying pan, and the grease pops, and in boiling liquid into the air.
Class C fires are fueled by electrical current traveling to wires, circuits, and outlets. Class C extinguishers most commonly use a dry chemical powder to smother the fire. In more sensitive environments such as a recording studio, a Class C extinguisher may use a halon gas that does not leave a residue. These are often referred to as clean agents. You would also never want to use water on a Class C fire for obvious reasons.
Most household extinguishers are a combination of Class A, B, and C ratings. These extinguishers can be used on ordinary combustible fires, liquid fires, and electrical fires.
The last of the four common classifications of fire is the Class D fire. The Class D fires fueled by combustible metals such as magnesium, potassium, and sodium. Class D fire extinguishers are used exclusively for Class D fires, and use materials such as sand, and dry chemical powders to smother the fire.
Special thanks to RVTCDEN who shared this video on Youtube.
WARNING – The carbon monoxide level would be increasing dramatically in the Moscow region as well as in the capital center. According to some sources, hotspots rose up to 564. Italy and Ukraine promised aircraft to smother fires. France reportedly is about to provide some help as well.